I have had this thing for years and really not sure about it. It has some damage repair but seems to be in serviceable shape. Closest thing I can find for it in Pegasus catalogue is their part number 1405 - Titan FF/FC/S2 Gearbox Adapter Ring for 2 or 3 bolt starter. Not sure if this is the same thing but seems similar. See photos. Pegasus gets a whopping $599 for one.
Let me know what you think it's worth to you. I've no use for it.
Thanks,
John Gaither